Starting at 1:00 Charles discusses frequency and seems to me to say that no one has become an elite squatter without squatting 9-15 times per week. WTF does he mean here? I thought he meant per month but then he clearly says that this is opposed to 2x/week working for the bench press. Any guesses?

Right, very likely most of that is technique work or “strength skill”, which gets you to a weight that actually has some carry over to your top end strength (squatting the bar doesnt really give you a sense of what squatting you 1RM feels like, or keep you in the same form) but without the volume or intensity to cause you too much fatigue. It might not even be taxing enough to generate a training effect, only to solidify technique.

Its not a “leg day” or a “squat session” in that sense, but just another exposure to squatting.